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LM3279 Folha de dados(PDF) 3 Page - Texas Instruments

Nome de Peças LM3279
Descrição Electrónicos  LM3279 Buck-Boost Converter With MIPI짰 RFFE Interface for 3G And 4G RF Power Amplifiers
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Fabricante Electrônico  TI [Texas Instruments]
Página de início  http://www.ti.com
Logo TI - Texas Instruments

LM3279 Folha de dados(HTML) 3 Page - Texas Instruments

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SCLK
GPO0
GND
VOUT
SDATA
VCON
VIO
FB
GPO1
SW2
EN
SGND
SVIN
PGND
PVIN
SW1
A
B
C
D
1
2
3
4
LM3279
www.ti.com
SNVS970C – MARCH 2013 – REVISED OCTOBER 2014
5 Pin Configuration and Functions
DSBGA
16 Pins
Pin Functions
PIN
TYPE
DESCRIPTION
NUMBER
NAME
Digital control interface (DCON) RFFE Bus clock input. Typically connected to RFFE master
A1
SCLK
IN
on RF or Baseband IC. SCLK must be held low when VIO is not applied.
Digital control interface (DCON) RFFE Bus data input/output. Typically connected to RFFE
B1
SDATA
I/O
master on RF or Baseband IC. SDATA must be held low when VIO is not applied.
Digital control interface (DCON) 1.8-V supply input. VIO functions as the RFFE interface
reference voltage. VIO also functions as a reset and enable input to LM3279. Bypass
C1
VIO
IN
capacitor should be connected between VIO and GND. Typically connected to voltage
regulator controlled by RF or Baseband IC. When VIO = HIGH, EN shall be connected to
GND.
D1
GND
Ground
Digital Ground.
Multipurpose GPIO. When VIO = HIGH, GPO0 is a general purpose output for configuring RF
front end circuitry. When the GPO0 control bit in Register 02 is set to 1, the output is driven
A2
GPO0
I/O
to a 1.8-V (VIO) high logic level. The output is pulled to a low logic level when the GPO0
control bit is set to 0. (Input has an internal pull-up resistor.)
Voltage Control Analog input. When EN = HIGH, VCON controls the output voltage in PWM
B2
VCON
IN
and PFM modes. When in Digital control, VCON can be left as no connect or connected to
system ground.
Feedback input to inverting input of error amplifier. Connect output voltage directly to this
C2
FB
Ground
node at load point.
Regulated output voltage of LM3279. Connect this to a 10-µF ceramic output filter capacitor
D2
VOUT
PWR
to GND.
Multipurpose GPIO. When VIO = HIGH, GPO1 is a general purpose output for configuring RF
front end circuitry. When the GPO1 control bit in Register 02 is set to 1, the output is driven
A3
GPO1
I/O
to a 1.8-V (VIO) high logic level. The output is pulled to a low logic level when the GPO1
control bit is set to 0. (Input has an internal pull-up resistor.)
Enable Pin. Pulling this pin higher than 1.2 V enables part to function in analog control mode.
B3
EN
IN
VIO must be tied to ground.
C3
SGND
Ground
Signal Ground for analog circuits and control circuitry.
Switch pin for Internal Power Switches M3 and M4. Connect inductor between SW1 and
D3
SW2
PWR
SW2.
A4
SVIN
PWR
SVIN is no connect. Analog supply is internally connected to PVIN.
Power MOSFET input and power current input pin. Optional low-pass filtering may help
B4
PVIN
PWR
reduce radiated EMI and noise during buck and buck-boost modes.
Switch pin for Internal Power Switches M1 and M2. Connect inductor between SW1 and
C4
SW1
PWR
SW2.
D4
PGND
Ground
Power Ground for Power MOSFETs and gate drive circuitry.
Copyright © 2013–2014, Texas Instruments Incorporated
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